IV. Account of a Booh^ La Meridiana del 
Tempio de S. Petronio , &*c. i. e. The 
Meridian Line of the Church of St. Petronio 
drawn and fitted for Afironomical Obfervati* 
ons in the Tear 1655. rewjed and rejiored in 
the Tear i6pt^. by Signior John Dominlco 
Caflini, Primary Ajironomer of the School of 
Bononia, Pontijicial Mathematician^ of the 
Koyal Academy of Sciences ^andK.S. Printed at 
Bononia 16^5. in Twenty Two Sheets in FoL 
IN this Book (written in part by Signior Cajitti^ whilft 
in Itafyy but augmented and publilhed by Signior Do* 
minico Guglielmini after his departure thence) there is an 
Account given of the Occafion of the making of this 
Meridian Line by S. Cajfint^ in the Year 1655. of the 
Method of doing it, and of the Exadnefs with which 
it was performed at that time by him : Then of the 
Ufes that have been made of it, and of the Alterations 
that have happened to this Church fince that time, and 
of the Reftauration and Verification of it in the Year 
I (Spy, by the faid Signior Caffmi himfelf ; and laftly, of 
the Ufes that may be made of it for the future. 
To this Difcourie, which was written by Signior Caffi- 
ni himfelf, is adjoined a Difcourfe of Signior Dommco 
Guglielmini i Mathematician and Publick Lecturer of 
Bononia^ giving an Account of the Operations made, and 
of the Inftruments imployed in this laft Reftauration of 
the (aid Meridian Line. 
In 
